Short-term kitFirst Alert
RD1 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 2 to 4 days
Locations and reports
Radon Levels in Hawaii County, Hawaii
EPA puts Hawaii County in Zone 3, its lowest radon zone. Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Ground above low
None
Level with Hawaii
- Hawaii
- 0.0%
- Hawaii
- 0.0%
Share of land USGS rates moderate or high potential
Tests reported
0
None published
A home here needs its own test
EPA radon zone
Zone 3
Lower potential
- 1
- 2
- Zone 3
1 highest, 3 lowest
EPA predicts under 2 pCi/L indoors
Read a result for Hawaii County
Starts at EPA's action level
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 4.0 pCi/L
At or above 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher.
The data
Hawaii County, At a glance
Hawaii County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 99% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
No CDC test figures here
CDC has published no radon test figures for Hawaii County. Only a test tells you the level in a home.
Hawaii County, Compared
Hawaii County radon figures, compared
Calculated by Radon411No Hawaii county, Hawaii County included, has a radon test figure from CDC; over the 2006 to 2015 laboratory totals, the agency's counts name 2,669 counties in other states. Across every county in the country with a figure (2,669), 36.3% of reported tests reached that level; no Hawaii county contributes to that pool.
EPA's 1993 map puts Hawaii County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 99% of the county's land low radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Hawaii County, Geology
The ground under Hawaii County
PredictedUSGS's geologic map puts all of Hawaii County's mapped land in one class: low radon potential. 99.0% of it lies in the area the map calls Hawaii, to which USGS gives a radon index of 5, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Hawaii | Primarily alkalic and tholeiitic basalt, colluvium and alluvium derived from basalt, lesser amounts of marine sediments and carbonate rocks | Low | 5 | 99.0% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Hawaii County beside the ground around it
Neither Hawaii County nor Hawaii as a whole has any land USGS rates above low potential.
The map rates the ground, not the air in any home.
Local help
Hawaii County, Local resources
Radon testing and mitigation in Hawaii County
- Hawaii's radon programHawaii's radon program answers questions about testing, mitigation and the rules where you live.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsAsk the program whether it has free or discounted kits, or compare kits you can buy.
- Compare kits
- See the Hawaii directoryNo professionals are listed in Hawaii yet. The state program can point you to registered testers and mitigators.
What it means
Hawaii County, Questions
Questions about radon in Hawaii County
Are radon levels high in Hawaii County?
No CDC testing statistics are published here for Hawaii County, Hawaii yet. No county within 250 miles of Hawaii County has a CDC figure, so the only comparison is the national pool: 36.3% of reported tests at or above 4 pCi/L.
Which counties border Hawaii County?
No county is recorded as sharing a land boundary with Hawaii County.
Products
Hawaii County, Products
Testing a home in Hawaii County
No CDC figure names Hawaii County, and none within 250 miles of it: a test of this home is the only reading it will get. Zone 3 is the lowest label, yet homes at or above 4 pCi/L occur in every zone: a short-term kit (2 to 90 days) is the quick first check in Hawaii County.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
Monitor
EcoQube Flex battery digital radon monitor with an e-ink screen
- C-NRPP 2024/25: Not included
- Battery
- Bluetooth
- Alarm
- Screen, app
Method: Ion chamber
First reading: Within 15 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Hawaii County, Bordering counties
Counties bordering Hawaii County
Calculated by Radon411No bordering counties on file
Hawaii County has no county recorded as sharing a land boundary with it. Island and coastal county equivalents legitimately have none.
Hawaii County, Residents
Who lives in Hawaii County
The Census Bureau estimates 210,043 residents in Hawaii County for July 1, 2025, 9,299 more than in 2020 (+4.6%). That works out to 52 people per square mile of land.
Census lists no incorporated place in Hawaii County: every home in it reads the county's figures.
Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025).
Hawaii County, Homes
Homes in Hawaii County
Hawaii County is a place of houses on their own lots: 77% of its 89,786 homes are detached single-family houses, against 54% across Hawaii. Much of Hawaii County is recent building: 30% of its homes have gone up since 2000 and the middle year built is 1988, against 1979 for Hawaii. 73% of occupied homes are lived in by their owner (Hawaii: 63%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Hawaii County | Hawaii |
|---|---|---|
| Housing units | 89,786 | 564,905 |
| Detached houses | 77% | 54% |
| In buildings of 5 or more | 14% | 31% |
| Mobile homes | 1% | under 1% |
| Built before 1960 | 10% | 15% |
| Built since 2000 | 30% | 20% |
| Middle year built | 1988 | 1979 |
| Owner-occupied | 73% | 63% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.